Assuming you already own Poly-Ana? If not, note that we're currently offering Stunning Phaser for free along with Poly-Ana (which itself is currently 50% off). If anyone who bought SP since the new year missed this and wants in on the package deal, just email us and we'll knock your SP payment off PA's price.

Yes, I already own Poly-Ana. Purchased it in October 2015 while you promoted it on this forum. Maybe you remember: I'm the guy who wrote a song of which the intro, using the Poly-Ana preset 'BASS-Synth-werk', reminded you of a Boards of Canada song called RoyGBiv?

BTW I like the green color and it will be interesting to see where you will take this phaser in the near future. Can't wait!

Happy birthday! At 50, life is just beginning. My birthday is in 8 days and I will reach a milestone too, only it starts with a 7...

You're probably already aware of this but phasing and flanging, while similar in character, have sonic differences because they are obtained differently.
Phasing usually uses a bunch of all pass filters swept by an LFO to create moving phase shifts in the spectrum which are then mixed back into the dry signal.
Flanging uses delays swept by an LFO (when done electronically) which are then mixed with the dry signal to create comb filtering and doppler shifting. The "through the null" effect is achieved by inverting the polarity of one of the signals.
Both often use a variable feedback of the output to the input to add resonance to the effect.

My FX chain, as you know, is designed to simulate the mechanical flanging effect of two open reel decks manipulated by hand. This is quite a different effect to phasing and I tend to use both for different applications.

I was going to play around with ReaEQ and all pass filters with parameter modulation to create my own phasing effect (and I will probably still do so simply because I love to experiment) but this 'Stunning Phaser' gets me the sound of my favourite hardware phasers (Eventide and Roland) quite effectively.

Yes, we applied our usual tricks to this one so, while it costs a bit more CPU power than a typical stereo phaser will, it's well worth it in the sound quality it produces. (I expect before we're done the Beta there'll be a Quality control added to let you get "draft" quality to save a bit of CPU during tracking, etc. But it's not that bad now, though the Saturator coming in the 0.2.0 update is probably going to push it into noticeable when it's on.)

And yes, control curves. We're still fiddling with those, but please also note that you can get a finer degree of control in the two circular knob modes (Circular and the rarely implemented Relative-Circular mode) by moving your mouse far away from the knob as you turn it. You essentially get the entire circumference of your screen in pixels to adjust it, vs. just the length of the control that most linear sliders offer. We also offer a Linear mode, and you can turn that to fine control by holding SHIFT while you move the knob. (You can also switch between all thee knob modes on the fly with the other modifier keys!) These knob modes are set by the VST host-preference, which better hosts (and there are none better than Reaper) implement.

Thanks for the tips on the modifiers too. I'd found some of those through curiosity.

What's the best way to submit feature requests and bugs during beta testing? I'm regularly here on the REAPER forum if that works for you. One advantage of that is that others could see requests and that might hopefully prevent multiple requests for the same thing and also inspire other similar requests leading to an efficient pooled resource which this forum is renowned for.

While we're talking controls, are the LFO depth and rate controls calibrated exponentially? The very ends of the range are extreme at both ends but a bit hard to access. Is there any way to change the mode of these to 'stretch out the range' over the knob travel (I know I can shift-drag)? I love those super-slow speeds!

The saturation control seems to have a level jump at the very beginning of its adjustment (ie, as soon as it is turned up, the level jumps). It would be good if this could be made more gradual.

Still looking for far more adjustment of the slow LFO rates. It seems to go from very slow (0.05 I think) to a considerable step faster in one step. It would be great to have fine control of rates from several seconds to 1-2 Hz in a slow range setting if possible.

I may be misunderstanding how phasers work, but does this plugin give the ability to manually control the sweep through automation? in other words, can I set a slope to go from 0 to 90 degrees out of phase over an arbitrary time frame?

I see the "off" LFO option in the GUI screenshot so I'd assume this is possible but thought I'd confirm.

No biggie regarding sidechain. That's reasonably easy to achieve in REAPER as is by using parameter modulation. It would be simple enough just to parameter modulate the center frequency knob to get the same effect.
That's one of the great things in REAPER that I use constantly.

Thanks for understanding. And yes, excellent point! Reaper can do that already!

What a great product Reaper is! I very rarely look at a piece of software and doubt I could do a better job of it but that's exactly how I feel about Reaper. Though I do wish they'd bring back the ability to patch feedback loops which they reportedly "fixed" in a recent update. Even though I've never used it, I liked that it was possible. Most developers spend far too much time writing code that disables their users instead of enabling them, which I just never understand. Like the multi-channel connection issues I described above, for example. Another one is the forced distinction between effect and instrument that most plug-in standards impose. (And that Reaper wisely ignores completely! Thus proving that there was never any need for the distinction in the first place.) Would be nice if they could add an option to enable the possibility of feedback loops.

Do you mean feedback loops where you have one track sending to another and then back to the first one?
That is still possible in REAPER but you need to make sure the option is turned on in the project settings (alt+enter).

I'm actually using that feature in a current project running the latest version of REAPER. I'm using it to process a feedback signal to ReaDelay.